Portsmouth quadrangle, New Hampshire--Maine, 1956 [cartographic material] : 7.5 minute series (topographic) / mapped by the Army Map Service ; revised by the U.S. Geological Survey ; control by USGS and NOS/NOAA..
- Relief shown by contours and spot heights. Filing title: Portsmouth, N.H.--Me. "Revisions shown in purple compiled by the U.S. Geological Survey from aerial photographs taken 1990 ... map edited 1993." "SE/4 Dover 15' quadrangle." "43070-A7-TF-024." "DMA 6870 III SE--Series V812." Includes quadrangle location map.
- The Survey ;
- Held by
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